package com.lagou.web.servlet;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SimplePropertyPreFilter;
import com.lagou.base.BaseServlet;
import com.lagou.pojo.Course;
import com.lagou.service.impl.CourseServiceImpl;
import com.lagou.utils.DateUtils;

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;

@WebServlet("/course")
public class CourseServlet extends BaseServlet {
    CourseServiceImpl cs = new CourseServiceImpl();

    public void findCourseList(HttpServletRequest request, HttpServletResponse response) {

        //接收参数
        //业务处理

        List<Course> courseList = cs.findCourseList();
        for (Course course : courseList) {
            System.out.println(course.getPrice());
        }

        //响应结果
        SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id", "course_name", "price", "sort_num", "status");
        String result = JSON.toJSONString(courseList, filter);

        try {
            response.getWriter().println(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //根据条件查询课程信息
    public void findByCourseNameAndStatus(HttpServletRequest request, HttpServletResponse response) {
        try {
            //接收参数
            String course_name = request.getParameter("course_name");
            String status = request.getParameter("status");

            //业务处理
            List<Course> courseList = cs.findByCourseNameAndStatus(course_name, status);

            //返回结果
            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id", "course_name", "price", "sort_num", "status");
            String result = JSON.toJSONString(courseList, filter);

            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    //根据课程id，查询课程信息
    public void findCourseById(HttpServletRequest request, HttpServletResponse response) {

        try {
            //接收参数
            String id = request.getParameter("id");

            //业务处理
            Course course = cs.findCourseById(Integer.parseInt(id));

            //返回结果

            SimplePropertyPreFilter filter = new SimplePropertyPreFilter(Course.class, "id",
                    "course_name", "brief", "teacher_name", "teacher_info", "price", "price_tag",
                    "discounts", "preview_first_field", "preview_second_field", "course_img_url", "share_title",
                    "share_description", "course_description", "share_image_title");
            String result = JSON.toJSONString(course, filter);

            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //修改课程状态
    public void updateCourseStatus(HttpServletRequest request, HttpServletResponse response) {

        try {
            //获取参数
            String id = request.getParameter("id");

            //业务处理,根据课程id查询课程信息
            Course course = cs.findCourseById(Integer.parseInt(id));

            //判断课程状态，进行取反设置
            int status = course.getStatus();
            if (status==0){
                course.setStatus(1);
            }else {
                course.setStatus(0);
            }

            //更新修改时间
            course.setUpdate_time(DateUtils.getDateFormart());

            //修改状态
            Map<String, Integer> map = cs.updateCpurseStatus(course);

            //响应结果
            String result = JSON.toJSONString(map);

            response.getWriter().print(result);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}
